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TAXATION - Company's subsidiaries (Details) ¥ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2030 | Dec. 31, 2029 | Dec. 31, 2028 | Dec. 31, 2027 | Dec. 31, 2026 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019
Taxation |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  |  |  |  |  |  | 25.00% | 25.00% | 25.00% | 25.00% |
Undistributed earnings deferred tax liability |  |  |  |  |  |  |  |  | ¥ 0 |  |  |  |
Income tax expense |  |  |  |  |  |  |  |  | ¥ 682 | $ 99 | ¥ 270 | ¥ 355 |
Ctrip Computer Technology |  |  |  |  |  |  |  |  |  |  |  |  |
Taxation |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  |  |  |  |  |  | 15.00% | 15.00% |  |  |
Ctrip Travel Network |  |  |  |  |  |  |  |  |  |  |  |  |
Taxation |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  |  |  |  |  |  | 15.00% | 15.00% |  |  |
Ctrip Travel Information |  |  |  |  |  |  |  |  |  |  |  |  |
Taxation |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  |  |  |  |  |  | 15.00% | 15.00% |  |  |
Beijing Hujinxinrong Technology Co Ltd |  |  |  |  |  |  |  |  |  |  |  |  |
Taxation |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  |  |  |  |  |  | 15.00% | 15.00% |  |  |
Cayman |  |  |  |  |  |  |  |  |  |  |  |  |
Taxation |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  |  |  |  |  |  | 0.00% | 0.00% |  |  |
Hong Kong Profits Tax |  |  |  |  |  |  |  |  |  |  |  |  |
Taxation |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  |  |  |  |  |  | 16.50% | 16.50% |  |  |
PRC Corporate Income Tax |  |  |  |  |  |  |  |  |  |  |  |  |
Taxation |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  |  |  |  |  |  | 25.00% | 25.00% |  |  |
PRC Corporate Income Tax | Western region of China | Chengdu Ctrip |  |  |  |  |  |  |  |  |  |  |  |  |
Taxation |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable tax rate approved (as a percent) | 15.00% | 15.00% | 15.00% | 15.00% | 15.00% | 15.00% | 15.00% | 15.00% | 15.00% | 15.00% | 15.00% |  |
PRC Corporate Income Tax | Western region of China | Chengdu Ctrip International |  |  |  |  |  |  |  |  |  |  |  |  |
Taxation |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable tax rate approved (as a percent) | 15.00% | 15.00% | 15.00% | 15.00% | 15.00% | 15.00% | 15.00% | 15.00% | 15.00% | 15.00% | 15.00% |  |
PRC Corporate Income Tax | Western region of China | Chengdu Information |  |  |  |  |  |  |  |  |  |  |  |  |
Taxation |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable tax rate approved (as a percent) | 15.00% | 15.00% | 15.00% | 15.00% | 15.00% | 15.00% | 15.00% | 15.00% | 15.00% | 15.00% | 15.00% |  |
PRC Corporate Income Tax | High new tech enterprises | Ctrip Computer Technology |  |  |  |  |  |  |  |  |  |  |  |  |
Taxation |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  |  |  |  |  |  | 15.00% | 15.00% | 15.00% | 15.00% |
PRC Corporate Income Tax | High new tech enterprises | Ctrip Travel Network |  |  |  |  |  |  |  |  |  |  |  |  |
Taxation |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  |  |  |  |  |  | 15.00% | 15.00% | 15.00% | 15.00% |
PRC Corporate Income Tax | High new tech enterprises | Qunar Software |  |  |  |  |  |  |  |  |  |  |  |  |
Taxation |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  |  |  |  |  | 15.00% | 15.00% | 15.00% | 15.00% |  |
PRC Corporate Income Tax | High new tech enterprises | Qunar Beijing |  |  |  |  |  |  |  |  |  |  |  |  |
Taxation |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  |  |  |  |  | 15.00% | 15.00% | 15.00% | 15.00% |  |
PRC Corporate Income Tax | High new tech enterprises | Ctrip Travel Information |  |  |  |  |  |  |  |  |  |  |  |  |
Taxation |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  |  |  |  |  |  | 15.00% | 15.00% | 15.00% | 15.00% |
PRC Corporate Income Tax | High new tech enterprises | Beijing Hujinxinrong Technology Co Ltd |  |  |  |  |  |  |  |  |  |  |  |  |
Taxation |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 15.00% | 15.00% | 15.00%
PRC Corporate Income Tax | High new tech enterprises | Shanghai Xielv Information Technology Co., Ltd |  |  |  |  |  |  |  |  |  |  |  |  |
Taxation |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  |  |  |  |  | 15.00% | 15.00% | 15.00% | 15.00% |  |
PRC Corporate Income Tax | High new tech enterprises | Ctrip Business Travel Information Service (Shanghai) Co., Ltd |  |  |  |  |  |  |  |  |  |  |  |  |
Taxation |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable tax rate (as a percent) |  |  |  |  |  |  |  | 15.00% | 15.00% | 15.00% | 15.00% |  |
Domestic country |  |  |  |  |  |  |  |  |  |  |  |  |
Taxation |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense |  |  |  |  |  |  |  |  | ¥ 476 |  | ¥ 373 | ¥ 528 |
Foreign country |  |  |  |  |  |  |  |  |  |  |  |  |
Taxation |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense |  |  |  |  |  |  |  |  | ¥ 206 |  | ¥ (103) | ¥ (173) |

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